Rugæ-mold for denture-plates.



G. A. CRITCHERSON.

HUGE MOLD FOR DENTURE PLATES.

APPLlCATlON FILED JAN.2.1915.

1 ,1 83,540, Patented May 16, 1916.

THE COLUMBIA PMNDUMPH C0.. WASHINGTON, D. c..

UNITED STATES PATENT cur os. I

GEORGE ALBERT ORITCI-IERSON, 0]? LOS ANGELES, CALIFORNIA, ASSIGNOR TOTHE COLUMBUS DENTAL MANUFACTURING CO., OF COLUMBUS, OHIO, A CORPORATION.

HUGE-MOLD FOR DENTURE-PLATES.

Application filed January 2, 1915.

To all whom it may concern Be it known that I, GEORGE A. CRITCI-IER soN,a citizen of the United States of America, residing at Los Angeles, inthe county of Los Angeles and State of California, have invented certainnew and useful Improvements in Rugae-Molds for Denture- Plates, of whichthe following is a specification.

This invention is an improvement on the rugae mold disclosed in myapplication originally filed November 22, 1913, Serial No. 802,452 andnow claimed in divisional application filed May 1, 1914:, Serial No.835,669.

Heretofore in the manufacture of denture plates they have been moldedwith an upper surface to fit the rugae or undulations of the roof of themouth, but with a smooth surface for the under or lingual surface of theplate, or artificial roof of the month, which results in imperfectarticulation and in imperfect management of food in mastication, becausewhen the under surface, or lingual side, of the plate is smooth thetongue has but little power to hold or manipulate a morsel of food uponit.

As in the rugae mold heretofore invented by me the mold forming thesubject matter of this invention is formed with a natural rugae, but noclaim is herein made for this parse as that feature is claimed in myformer application.

The object of my present invention is to provide a rugae mold of metalin proper form and of a thickness sufficient to hold the corrugations orundulations constituting the rugae mold, while the outer marginal edgeportion of the metal of the mold is much thinner than the portion inwhich the rugae is formed, whereby said marginal portion more readilylends itself to the work of burnishing and adjusting to the entiresurface of the plate and between the teeth so that no polishing orburnishing of the denture plate will have to be done after the rugaemolds have been removed from the vulcanized plate.

In the drawings: Figure l is a plan view of the lingual side of adenture plate with my improved rugae mold burnished in posi-Specification of Letters Patent.

Patented May 16, 1916.

Serial No. 451.

tion thereon. Fig. 2 is a plan View of the lingual side of the rugaemold detached. Fig. 3 is a plan View of the lingual side of a rugae moldas it is furnished to the trade. Fig. 4 is a vertical sectional view onthe line H of Fig. 3.

The reference numeral 5 designates a denture plate and 6 teeth securedthereto. The rugae mold 7 is composed of metal, or any other suitablematerial, the middle portion of which is much thicker than the marginalportion 8. In other words the mold is made of different thickness indifierent portions of its area. The middle or interior portion of metalin which a natural rugae is formed must be of suflicient thickness tomaintain the formation given it in forming therein the corrugations orundulations constituting the rugae, while the marginal portions of themetal should be relatively thinner than the middle portion, so as tolend itself to the work of burnishing and adjusting the rugae to the"entire surface of the plate, and burnishing and adjusting the marginalportions between the teeth as shown in Fig. 1. When the mold has beenthus burnished and adjusted on a plate, it is not necessary to polish orfinish the plate after the mold has been removed. The relatively thinmarginal portion of the mold enables me to readily burnish it up to andbetween the teeth whereby it may be adapted to the individual case.

In using this invention the dentist waxes up as usual, and has the baseplate of the same thickness on palatal portion of the base plate as thedesired thickness in the finished plate. Just before fiasking place arugac mold upon the base plate in correct relation to the teeth, notforcing it into the base plate, but with a comparatively soft implementpress around the edges gently pressing the mold in place. After theplate has been fiasked and vulcanized and the mold removed from theplate it will be found that it will not be necessary to polish theplate. When the rugae mold has been removed it will have theconfiguration shown in Fig. 2, the pointed portions 9 having extendedbetween the teeth, while the tongues 10 at the rear have been fittedaround the back of the last tooth of the plate.

What I claim is:

A rug-0e mold comprising a relatively thick In testimony whereof I affixmy signature 111 presence of tWo Witnesses.

GEORGE ALBERT GRITOIIERSON.

middle portion having the formation of a WVitnesses: natural i'ugee, anda relatlvely thin marginal C. P. SHEEHY, portlon. R. B. TREAT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

